package com.rljk.utils;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;

import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * Author:   YASUO
 * Date:     2018/8/10 18:01
 * Description:二维码工具类
 */
public class ZXingCodeUtil {

    private static final int QRCOLOR = 0xFF000000;   //默认是黑色
    private static final int BGWHITE = 0xFFFFFFFF;   //背景颜色


    public static void main(String[] args) throws WriterException {
        try {
            //getLogoQRCode("https://www.baidu.com/", null, "跳转到百度的二维码");
            getQRCode("https://www.baidu.com/", null, "跳转到百度的二维码",new File("c:\123.jpg"));

        }
        catch (Exception e)  {
            e.printStackTrace();
        }
    }

    /**
     * 二维码解析
     * @param file 二维码图片文件
     * @return 解析结果
     */
    public static String parseQRCode(File file) {
        BufferedImage image;
        try {
            image = ImageIO.read(file);
            LuminanceSource source = new BufferedImageLuminanceSource(image);
            Binarizer binarizer = new HybridBinarizer(source);
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
            Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            Result result = new MultiFormatReader().decode(binaryBitmap, hints);// 对图像进行解码
            return result.getText();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        } catch (NotFoundException e) {
            e.printStackTrace();
            return null;
        }
    }


    /**
     * 生成不带logo的二维码
     * @param qrUrl 链接地址
     * @param request 请求
     * @param productName 二维码名称
     * @param file 上传路径+文件名
     * @return
     */
    public static String getQRCode(String qrUrl,HttpServletRequest request,String productName,File file ) {
        // String filePath = request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";
        //filePath是二维码logo的路径，但是实际中我们是放在项目的某个路径下面的，所以路径用上面的，把下面的注释就好

        String content = qrUrl;
        try {
            ZXingCodeUtil zp = new ZXingCodeUtil();
            BufferedImage image = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, 400, 400, zp.getDecodeHintType());
            image.flush();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            baos.flush();
            ImageIO.write(image, "png", baos);
            //二维码生成的路径，但是实际项目中，我们是把这生成的二维码显示到界面上的，因此下面的折行代码可以注释掉
            //可以看到这个方法最终返回的是这个二维码的imageBase64字符串
            //前端用 <img src="data:image/png;base64,${imageBase64QRCode}"/> 其中${imageBase64QRCode}对应二维码的imageBase64字符串
            //new File("E:/" + new Date().getTime() + "test.png")
            //判断目标文件所在的目录是否存在
            if(!file.getParentFile().exists()) {
                //如果目标文件所在的目录不存在，则创建父目录
                System.out.println("目标文件所在目录不存在，准备创建它！");
                if(!file.getParentFile().mkdirs()) {
                    System.out.println("创建目标文件所在目录失败！");
                }
            }
            ImageIO.write(image, "png", file);

            String imageBase64QRCode =  new sun.misc.BASE64Encoder().encodeBuffer(baos.toByteArray());
            baos.close();
            return imageBase64QRCode;
        }
        catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 生成带logo的二维码图片
     * @param qrUrl 链接地址
     * @param request 请求
     * @param productName 二维码名称
     * @param logoFile logo文件
     * @param createFile 生成的文件路径
     * @return
     */
    public static String getLogoQRCode(String qrUrl,HttpServletRequest request,String productName,File logoFile,File createFile) {
        // String filePath = request.getSession().getServletContext().getRealPath("/") + "resources/images/logoImages/llhlogo.png";
        //filePath是二维码logo的路径，但是实际中我们是放在项目的某个路径下面的，所以路径用上面的，把下面的注释就好
        String content = qrUrl;
        try{
            ZXingCodeUtil zp = new ZXingCodeUtil();
            BufferedImage bim = zp.getQR_CODEBufferedImage(content, BarcodeFormat.QR_CODE, 400, 400, zp.getDecodeHintType());
            return zp.addLogo_QRCode(bim, logoFile , new LogoConfig(), productName, createFile);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /** * 给二维码图片添加Logo * * @param qrPic * @param logoPic */
    public String addLogo_QRCode(BufferedImage bim, File logoPic, LogoConfig logoConfig, String productName, File createFile) {
        try {
            /** * 读取二维码图片，并构建绘图对象 */
            BufferedImage image = bim;
            Graphics2D g = image.createGraphics();

            /** * 读取Logo图片 */
            BufferedImage logo = ImageIO.read(logoPic);
            /** * 设置logo的大小,本人设置为二维码图片的20%,因为过大会盖掉二维码 */
            int widthLogo = logo.getWidth(null)>image.getWidth()*3/10?(image.getWidth()*3/10):logo.getWidth(null),
                    heightLogo = logo.getHeight(null)>image.getHeight()*3/10?(image.getHeight()*3/10):logo.getWidth(null);

            /** * logo放在中心 */
            int x = (image.getWidth() - widthLogo) / 2;
            int y = (image.getHeight() - heightLogo) / 2;
            /** * logo放在右下角 * int x = (image.getWidth() - widthLogo); * int y = (image.getHeight() - heightLogo); */

            //开始绘制图片
            g.drawImage(logo, x, y, widthLogo, heightLogo, null);
            // g.drawRoundRect(x, y, widthLogo, heightLogo, 15, 15);
            // g.setStroke(new BasicStroke(logoConfig.getBorder()));
            // g.setColor(logoConfig.getBorderColor());
            // g.drawRect(x, y, widthLogo, heightLogo);
            g.dispose();

            //把商品名称添加上去，商品名称不要太长哦，这里最多支持两行。太长就会自动截取啦
            if (productName != null && !productName.equals("")) {
                //新的图片，把带logo的二维码下面加上文字
                BufferedImage outImage = new BufferedImage(400, 445, BufferedImage.TYPE_4BYTE_ABGR);
                Graphics2D outg = outImage.createGraphics();
                //画二维码到新的面板
                outg.drawImage(image, 0, 0, image.getWidth(), image.getHeight(), null);
                //画文字到新的面板
                outg.setColor(Color.BLACK);
                outg.setFont(new Font("宋体",Font.BOLD,30)); //字体、字型、字号
                int strWidth = outg.getFontMetrics().stringWidth(productName);
                if (strWidth > 399) {
                    // //长度过长就截取前面部分
                    // outg.drawString(productName, 0, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 5 ); //画文字
                    //长度过长就换行
                    String productName1 = productName.substring(0, productName.length()/2);
                    String productName2 = productName.substring(productName.length()/2, productName.length());
                    int strWidth1 = outg.getFontMetrics().stringWidth(productName1);
                    int strWidth2 = outg.getFontMetrics().stringWidth(productName2);
                    outg.drawString(productName1, 200  - strWidth1/2, image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 12 );
                    BufferedImage outImage2 = new BufferedImage(400, 485, BufferedImage.TYPE_4BYTE_ABGR);
                    Graphics2D outg2 = outImage2.createGraphics();
                    outg2.drawImage(outImage, 0, 0, outImage.getWidth(), outImage.getHeight(), null);
                    outg2.setColor(Color.BLACK);
                    outg2.setFont(new Font("宋体",Font.BOLD,30)); //字体、字型、字号
                    outg2.drawString(productName2, 200  - strWidth2/2, outImage.getHeight() + (outImage2.getHeight() - outImage.getHeight())/2 + 5 );
                    outg2.dispose();
                    outImage2.flush();
                    outImage = outImage2;
                }else {
                    outg.drawString(productName, 200  - strWidth/2 , image.getHeight() + (outImage.getHeight() - image.getHeight())/2 + 12 ); //画文字
                }
                outg.dispose();
                outImage.flush();
                image = outImage;
            }
            logo.flush();
            image.flush();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            baos.flush();
            ImageIO.write(image, "png", baos);

            //二维码生成的路径，但是实际项目中，我们是把这生成的二维码显示到界面上的，因此下面的折行代码可以注释掉
            //可以看到这个方法最终返回的是这个二维码的imageBase64字符串
            //前端用 <img src="data:image/png;base64,${imageBase64QRCode}"/> 其中${imageBase64QRCode}对应二维码的imageBase64字符串
            if(!createFile.getParentFile().exists()) {
                //如果目标文件所在的目录不存在，则创建父目录
                System.out.println("目标文件所在目录不存在，准备创建它！");
                if(!createFile.getParentFile().mkdirs()) {
                    System.out.println("创建目标文件所在目录失败！");
                }
            }
            ImageIO.write(image, "png", createFile);

            String imageBase64QRCode =  new sun.misc.BASE64Encoder().encodeBuffer(baos.toByteArray());
            baos.close();
            return imageBase64QRCode;
        }
        catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }


    /** * 构建初始化二维码 * * @param bm * @return */
    public BufferedImage fileToBufferedImage(BitMatrix bm){
        BufferedImage image = null;
        try
        {
            int w = bm.getWidth(), h = bm.getHeight();
            image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

            for (int x = 0; x < w; x++)
            {
                for (int y = 0; y < h; y++)
                {
                    image.setRGB(x, y, bm.get(x, y) ? 0xFF000000 : 0xFFCCDDEE);
                }
            }

        }
        catch (Exception e){
            e.printStackTrace();
        }
        return image;
    }

    /** * 生成二维码bufferedImage图片 * * @param content * 编码内容 * @param barcodeFormat * 编码类型 * @param width * 图片宽度 * @param height * 图片高度 * @param hints * 设置参数 * @return */
    public BufferedImage getQR_CODEBufferedImage(String content, BarcodeFormat barcodeFormat, int width, int height, Map<EncodeHintType, ?> hints) {
        MultiFormatWriter multiFormatWriter = null;
        BitMatrix bm = null;
        BufferedImage image = null;
        try{
            multiFormatWriter = new MultiFormatWriter();
            // 参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数
            bm = multiFormatWriter.encode(content, barcodeFormat, width, height, hints);
            int w = bm.getWidth();
            int h = bm.getHeight();
            image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

            // 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
            for (int x = 0; x < w; x++){
                for (int y = 0; y < h; y++) {
                    image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
                }
            }
        }
        catch (WriterException e){
            e.printStackTrace();
        }
        return image;
    }

    /** * 设置二维码的格式参数 * * @return */
    public Map<EncodeHintType, Object> getDecodeHintType() {
        // 用于设置QR二维码参数
        Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
        // 设置QR二维码的纠错级别（H为最高级别）具体级别信息
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 设置编码方式
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.MARGIN, 0);
        hints.put(EncodeHintType.MAX_SIZE, 350);
        hints.put(EncodeHintType.MIN_SIZE, 100);

        return hints;
    }
}

class LogoConfig {
    // logo默认边框颜色
    public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;
    // logo默认边框宽度
    public static final int DEFAULT_BORDER = 2;
    // logo大小默认为照片的1/5
    public static final int DEFAULT_LOGOPART = 5;

    private final int border = DEFAULT_BORDER;
    private final Color borderColor;
    private final int logoPart;

    /** * Creates a default config with on color {@link #BLACK} and off color * {@link #WHITE}, generating normal black-on-white barcodes. */
    public LogoConfig(){
        this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);
    }

    public LogoConfig(Color borderColor, int logoPart){
        this.borderColor = borderColor;
        this.logoPart = logoPart;
    }

    public Color getBorderColor() {
        return borderColor;
    }

    public int getBorder(){
        return border;
    }

    public int getLogoPart() {
        return logoPart;
    }

}
